# Older SDK Versions

- [Sign in with Email/Phone](https://docs.cotter.app/sdk-reference/react-native/older-sdk-versions/sign-in-with-email-phone.md): Our React Native SDK offers the easiest way to integrate Cotter 's email/phone verification. You can simply call a function and it does most of the heavy lifting and authentication for you.
- [Sending Code via WhatsApp](https://docs.cotter.app/sdk-reference/react-native/older-sdk-versions/sending-code-via-whatsapp.md)
- [Sign In with Device](https://docs.cotter.app/sdk-reference/react-native/older-sdk-versions/sign-in-with-device.md): Our React Native SDK offers the easiest way to integrate Cotter's Passwordless Login. You can simply call a function and it does most of the heavy lifting and authentication for you.
- [Authenticate from a Non-Trusted Device](https://docs.cotter.app/sdk-reference/react-native/older-sdk-versions/sign-in-with-device/authenticate-from-a-non-trusted-device.md)
- [Add a new Trusted Device](https://docs.cotter.app/sdk-reference/react-native/older-sdk-versions/sign-in-with-device/add-a-new-trusted-device.md)
- [Customization](https://docs.cotter.app/sdk-reference/react-native/older-sdk-versions/sign-in-with-device/customization.md): You can change the text and logo in most of the UI that's provided by Cotter's React Native SDK.